636562078

Appears in sequences

• Companion Pell numbers: a(n) = 2*a(n-1) + a(n-2), a(0) = a(1) = 2.at n=23A002203
• Numerators of continued fraction convergents to sqrt(8).at n=22A041010
• Numbers k such that (k^2 + 4)/2 is a square.at n=11A077444
• a(n) = floor((1+sqrt(2))^n).at n=23A080039
• Expansion of (1+x^2)/(1-2*x-x^2).at n=23A099425
• a(n) = -(u^n-1)*(v^n-1) with u = 1+sqrt(2), v = 1-sqrt(2).at n=22A129744
• a(1) = 2, a(2) = 8; a(n) = 2 a(n - 1) + a(n - 2) - 4*(n mod 2).at n=22A162484